Pot pressures are an interesting subject but in general terms about 30 to 50 PSI is sufficient for regular casts that don't have cracks or small crevices where the resin needs to reach, for that, you will require a little pressure and in this case, the more the better determined by the type of pressure pot you have and its factory PSI rating, both of mine are rated for 80 PSI but I have tested them for 100PSI and that is what I use in most of my casts.
There some of these cheap pots that are rated to 40PSI for a good reason, they are made with thin walls a thin lid and little to no reinforcing, the problem is that they can look all very identical from pics unless you know exactly what you are looking for.
Something like
this would be suitable and not overpriced, I can not say the same about
these guys, they triple the price just because they found out people were buying them for casting purposes and they had no issue because they are strong and made the same way as the one I just suggested before.
There are a few accessories that you will need to exchange/put on a pot like this, those parts are readily accessible and cheap, what they are and what to do, our library will show you many ways to do it, an IAP search will also produce many results.
Another important issue is that whatever the air compressor you will use, will need to have a water catcher/filter, resin and water/moisture pushed into the pot from the air-hose will create problems, guaranteed...!
Best of luck,
Cheers
George
